Abstract: The invention relates to a solid fired hot gas generator which comprises a plurality of solid burners for extending the regulating range, which form a multiple solid burner with an enlarged regulating range. A solid feed and a combustion air feed are assigned to each solid burner and with the aid of a dosing means a separate, dosed solid feed to each solid burner is guaranteed. The firing power of the multiple solid burner which is in particular a multiple impulse burner extends from the minimum power of one of the solid burners to the maximum power of all solid burners so that a regulation of all necessary load regions of a plant unit to be supplied is covered.

Abstract: The invention relates to a process for crushing raw lignite. The raw lignite is dried with an exit temperature after drying of approximately 70.degree. to 85.degree. C. The dried raw lignite is then crushed. This crushing of the dried raw lignite is performed in an air-swept roller mill, in which the crushing and cooling of the lignite particles is brought about by the inflowing cold and/or ambient air to a temperature range of below 60.degree. C.

Abstract: The invention relates to a process and an apparatus for the treatment of moist, explosive gas-dust mixtures, particularly coal dust mixtures in mill drying plants. To avoid a condensing out of residual moisture from intermediately stored dust, heated inert gas is supplied to the conveying system for the coal dust or the intermediate storage points.